[Liblas-devel] GPS time and intensity?

[Mateusz Łoskot]

Howard Butler wrote:
> On Oct 12, 2008, at 6:08 AM, Mateusz Łoskot wrote:
>> Jason Woolard wrote:
>>> Also, the GPS time seems to be rounding to the nearest second . My 
>>> input file has data to 3 decimal places. Is there any way to carry 
>>> that precision over?
>>
>> Aren't LiDAR observations (pulses) measured in seconds with fractions 
>> ignored?
> 
> I don't know the answer to this but the 1.0 and 1.1 specs say:
> 
> "The GPS time is the double floating point time tag value at which the 
> point was acquired."
> 
> The spec isn't very clear on this, and while it is true that the 
> <time.h> C functions don't deal with fractional seconds, it may be that 
> vendors are using them.  Maybe we should ask on the USGS board about 
> this question and see what people say.

Howard,

Good idea. I will ask.

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org